When Should Spark Plugs Be Replaced in a Car?
2 Answers
Spark plugs should be replaced when the car engine experiences difficulties in starting both when cold and hot, shaking after starting, poor acceleration, insufficient power, or frequent stalling at idle. The ignition coil can only provide a limited voltage, and as the spark plug electrodes wear out, the voltage required to bridge the spark plug gap increases. This can lead to vehicle shaking, difficulty in acceleration, and fuel wastage during rapid acceleration, high-speed driving, or heavy loads. Reasons for replacing spark plugs include: 1. Spark plugs becoming coated with deposits, which accumulate over time and prevent the spark plugs from functioning properly; 2. Spark plug erosion, where excessive carbon buildup in the combustion chamber leads to poor performance, and high temperatures in the combustion chamber can cause the spark plug electrodes to melt or erode.
When we're driving, if the car starts unusually slow or the idle shakes violently, like the engine is dancing, the spark plugs might be aging. Whenever I encounter this, I always check the manual for mileage first—regular cars should replace them every 30,000 kilometers, while high-performance cars might go up to 80,000. Last time my old car hiccuped and sputtered during acceleration, a check revealed severe carbon buildup on the spark plugs. After replacing them, it instantly ran smoothly again. During routine maintenance, the mechanic just needs to measure the electrode gap with a tool—don’t wait until fuel consumption skyrockets to address it. Spark plugs aren’t expensive; a set costs just a few dozen dollars, but delaying replacement can cause greater engine damage and affect overall lifespan. Remember, if the car feels off while driving, prioritize checking the spark plugs.
